Tap extension.



A. WAI-Z. TAP' EXTENSION. APPLICATION FILED APB.. 2, 1913.

Patented Mar. 3, 1914.

I more specifically,

UNITED s'rAwrE ANTON Walz, 'or

L. GaEENsLrr, ory

WORCESTER, MASSACHUSETTS, ASSIGNOR 0F ONE-HALF T0 ELIJAH WORCESTER, MASSACHUSETTS.

TAP EXTENSION.

Speoication of Letters Patent.

vPatented Mar. 3, 1914.

j Application filed Apri12. 1913. Serial No. 758,350.

To all whom it may concern Be it known that I, iN'roN Wiuz, a citizen of the United States, residing at l/Vorcester, in the county of Worcester and State of Massachusetts, have invented a new and useful Tap Extension, .of which the following is a specication.

This invention relates to a pulley tap or to a device for holding an ordinary tap to make it serve the purpose of an ordinary pulley tap. As 1s well knownpulley taps as usually made are the same as ordinary short taps, except that they have a long shank integral with the lcutting end ofthe tap. This renders it necessary to have in stock taps of various sizes made with the long shank.

The principal object of this invention is to provide a construction by which ordinary short taps can be used as pulley taps by combining with them a detachable holder or shank. v This is especially constructed. for the purpose of connecting it with the short taps, receiving the operating wrench, and lholding and guiding the tap during its operation; also to provide a construction of this kind in which a plurality of taps of different lengths can be used with a single holder, thus, reducing the expense.

Reference is to be had to the accompanying drawings, in which- Figure 1 is a central sectional view of a pulley showing how a pulley tap is used thereon when constructed in accordance with this invention, and Fig. 2 is an elevation of a tap extension partly in section on a central longitudinal plane.

The invention is shown in a simple form involving a main shank a of cylindrical form and uniform diameter throughout, eX- cept at the end where it has a non-circular projection b, in the present instance, square. At the other end it has a cylindrical socket c of a diameter sufficient to receive the cylindrical end of a tap A. At the end of this socket is a non-circular socket ci of the same shape and size substantially as the projection b and in aiiial alinement therewith. It may, however, be of slightly different length.

In operation an projection B adapted to having a cylindrical portion t the socket c 1s introduced into these ordinary tap A having a fit the socket d and C adapted to sock- .ets so that the cutting end thereof Aprojects therefrom. It will be understood that when this tap 1s. used for ordinary purposes the square projection B is designed for the application of a wrench thereto, but when it is applied to this attachment the samewrench E c an be applied to the projection b. Ihe tap belng applied to the attachment as indlcated, the whole device is introduced lnto the pulley F, through the holes G in the same manner as an ordinary pulley tap and. operated by a wrench from the end of projection b in the ordinary way. My device contains several features vital to such a construction, namely, it corresponds in outslde diameter to the outside diameter of the tap, the hole in the rim of a pulley through which said tap is to be passed always being of the same diameter as the tap used on said pulley; and, furthermore, the extension being of the' same diameter on the tap, the extension always has a bearing in the hole of the rim of the pulley. This prevents springin or wabbling and thereby reduces the lia ility of breakage, because it is always in perfect alinement.

It will be obvious that a number of different length taps A can be .employed at different times with this attachment and that the same wrench is employed with the attachment as would be employed if the tap were used alone. It will be seen moreover, that the tap is not only centered and positively driven by having its non-circular portion vD inserted in the socket d, but it is guided and held accurately in central position by having its cylindrical portion below held in the large circular socket c. In addition to this it will be seen that the holding device a is of substantially uniform diameter throughout and only a little larger than the shank of the tap so that it will pass through the holes G in the ulley designed for receiving the shank o the ordinary tap wrench.

Although I have illustrated and described a single embodiment of the invention, I am aware of the fact that modifications can be made therein by any person skilled in the art without departing from the scope of the invention as expressed in the claims. Therefore I do not wish to be limited to all the details of construction herein shown and described, but

a wrench and asocket'at the other end o substantially the samesize and shape as said projection and constituting the sole means for eceivin the endV of a tap having substantially t e same external diameter as that of the extension. i v

2. As an article of manufacture, a tap extension consisting of a substantially cylindrical rod having a non-circular projection at one end for receiving a wrench and a socket at the other end of substantially the same size and shape as said projection for receiving the end of a tap, and having a 'cylindrical socket constituting an integral part of the last named end beyond the nonaceaeac 'circular socket for receiving and rigidly holdin the cylindrical part of the tap.

3. T 1e combination with a tap of a tap extension consisting of `a-substantially cylind rical rod in a single piece having substantially the. same outside diameter as the threads o f said tap and havin a non-circular projection at one end an a socket at the other end of substantially the saine size and shape as said projection and in axial alinement therewith saidv socket constituting the sole means or receiving and holding the end of the tap.

In testimon whereof I have hereunto set my hand5 in t e presence of two subscribing y witnesses.

ANTON WAIZ. lWitiiessesz y ALBERT E. FAY,

ELIJAH L. GREENsLiT. 

